```{r}
posTweets = 0
negTweets = 0


for (i in 1:147)
  if (prop.word.length(tweet.corpus[[i]]) == TRUE)
    posTweets = posTweets + 1

for(i in 148:438)
  if (prop.word.length(tweet.corpus[[i]]) == TRUE)
    negTweets = negTweets + 1

posTweets = posTweets / 147
negTweets = negTweets / 290

phat = negTweets/(posTweets + negTweets)

phat
```